Pigment composition

FIELD: chemistry.

SUBSTANCE: water-based pigment composition contains polyalkylene glycol, having average molecular weight Mw from approximately 5000 to approximately 75000, and inorganic pigment particles containing colloidal particles based on silicon oxide or silicate or aggregates thereof. The amount of polyalkylene glycol ranges from 50 to 100 wt % with respect to the total amount of organic material in the composition, and the weight ratio of said colloidal particles to the organic material ranges from 1:3 to 30:1.

EFFECT: invention also relates to a method of producing said composition, use thereof to coat paper or cardboard, a method of obtaining coated paper or cardboard.

25 cl, 2 tbl, 4 ex

 

The present invention relates to a pigment composition and its preparation, its use, method of coating paper or cardboard and covered with paper or cardboard.

Development of printers inkjet printing has generated the need for paper, which is suitable for this purpose. In particular, there is a need in the paper, which is easy to manufacture, but nevertheless provides high quality inkjet printing.

For the production of paper suitable for inkjet printing, it presents the application of various types of coatings. Examples of such coatings are disclosed in publications of patent applications U.S. 2002/0039639, 2002/0164464, 2003/0099816, 2003/0224129, 2004/0255820 and 2005/0106317, in U.S. patents 4554181, 5551975, 6472013 and 6797347, and in applications WO 03/011981, WO 01/53107, WO 01/45956, EP 947349, EP 1120281, EP 1106373 and EP 1580019. Other examples include the U.S. patents 6416626, 5352503 and 6110601, revealing coating composition comprising silicon oxide, polyethylene glycol and an organic binder, such as starch or polyvinyl alcohol.

Examples of the new generation coating compositions based on silicon oxide or the silicate represented in the applications WO 2006/049545, WO 2006/049546 and WO 2006/049547.

Application WO 2006/049545 is coating composition comprising colloidal silica or aluminosilicate in combination with the filler particles.

Application WO 2006/049546 revealing the et cover composition, includes silicon oxide or aluminosilicate in combination with water-soluble aluminum salt or a cationic polymer.

Application WO 2006/049547 is coating composition comprising colloidal silica or aluminosilicate in combination with water-soluble aluminum salt or a cationic polymer, which can be used without any organic coating binders.

The objective of the invention is to create a pigment composition suitable for coating paper or paperboard used for inkjet printing, and which is easy to manufacture with high dry matter content.

Another object of the invention is to provide a coating mixture, which is characterized by ease of application to the surface of the paper or cardboard to make them suitable for inkjet printing.

Another additional object of the invention is to provide paper or paperboard, suitable for inkjet printing, which are easy to manufacture.

It was found that the problems can be solved with the help of a new pigment composition. Thus, one aspect of the invention relates to aqueous pigment composition, preferably in the form of aqueous dispersions, including polyalkyleneglycol and particles of inorganic pigment comprising colloidal particles on oslovakia silica or silicate, or their aggregates, in which polyalkyleneglycol ranges from 50 to 100 wt.%, preferably from 60 to 100 wt.% or from 70 to 100 wt.% from the total amount of organic material in the composition, and the mass ratio of colloidal particles based on silica or silicate, or their aggregates to organic material is from 1:3 to 30:1, preferably from 1:1 to 20:1 or 1.5:1 to 10:1.

It was found that the presence of polyalkyleneglycol allows you to create a high concentration of particles of inorganic pigment, providing the possibility of applying large quantities of pigment particles on the paper or cardboard in a single operation of the coating. Further, excellent results can be obtained by applying to a paper or paperboard coating of the pigment composition, not containing or containing only small amounts of other organic materials, in particular organic coating binders. Therefore, it is preferable that the pigment composition essentially contains or includes, based on the total number of pigment particles, less than 20 wt.%, preferably less than 10 wt.%, most preferably less than 3 or less than 1 wt.% organic coating binders. Examples of such organic coating binders include polyvinyl alcohols, optionally modified starches, gums, b is lawye binders (for example, casein and binders based on soy protein), latex (for example based on butadiene-styrene rubber, acrylates, vinyl acetate, copolymers of ethylene and vinyl acetate, styrene and esters of acrylic acid, etc. and mixtures thereof.

The term "polyalkyleneglycol"used here, refers to polymers of accelerated, preferably essentially not containing other copolymerizable monomers. Preferred polyalkylene glycols essentially do not contain substituents. The number of polyalkyleneglycol in the composition preferably ranges from about 1 to about 50 wt.%, most preferably from about 3 to about 25 wt.%. Applicable polyalkylene glycols include polyethylene glycol (PEG), polypropyleneglycol and their mixtures, of which the polyethylene glycol is most preferred. The average molecular mass Mwpolyalkyleneglycol is preferably from about 1000 to about 100000, most preferably from about 5000 to about 75000.

The particles of the inorganic pigment include colloidal particles based on silica or silicate, which are preferably synthetic and amorphous. The combination of relatively high quantities of colloidal particles based on silica or silicate with polyaki what anglicanum was found to provide excellent performance coated paper for printing.

The pigment particles at least of colloidal particles based on silica or silicate, or their aggregates, preferably have an average diameter of from about 0.005-about 25 microns, more preferably from about 0,007 to about 15 μm, most preferably from about 0.01 to about 10 microns. These particles preferably have a surface area from about 30 to about 600 m2/g, more preferably from about 30 to about 450 m2/g, most preferably from about 40 to about 400 m2/g or from about 50 to about 300 m2/, the Resulting surface charge of the pigment particles in the composition preferably is positive, in this case, the variance can be considered primarily as cationic.

The term "diameter"used here is related to the equivalent spherical diameter.

In the embodiment, colloidal particles include particles of oxide silicon, preferably in the form of an aqueous Sol of silicon oxide (silicosis). In yet another embodiment, the colloidal particles include particles on the basis of a silicate such as aluminum silicate or borosilicate, preferably in the form of water Zola. Examples of the colloidal Boros is lakatnik particles and their receipt include described, for example, in the application WO 99/16708. Can also be used mixtures of different types of colloidal particles based on silica-based and silica, or their aggregates.

Preferably the composition as a source of colloidal particles based on silica or silicate, or their aggregates consist of aqueous colloidal Sol, optional aggregated primary particles based on silica or silicate. The surface area of the primary particles is preferably from approximately 30 to approximately 600 m2/g, more preferably from about 30 to about 450 m2/g, most preferably from about 40 to about 400 m2/g or from about 50 to about 300 m2/year of dry matter Content in water the ashes of the primary particles is preferably from about 0.5 to about 70 wt.%, most preferably from about 1 to about 60 wt.%.

Colloidal primary particles based on silica or silicate is preferably formed from an aqueous solution of alkali metal silicate, where alkali metal ions are removed by using the method of ion exchange or where the pH of a solution of silicate of alkali metal has been reduced by adding acid. The method, based on ion exchange, is learn the basic principles, described in the book R.K. Iler, "The Chemistry of Silica" ("Chemistry of silica"), 1979, pages 333-334, and results in the aqueous Sol comprising colloidal negatively or positively charged particles from particles based on silica or silicate. The method based on the decrease in the pH of the silicate of an alkali metal, follows the basic principles described, for example, in U.S. patents 5176891, 5648055, 5853616, 5482693, 6060523 and 6274112.

The Sol may include colloidal primary particles of silica, which may or may not be modified in the core or on the surface of, for example, metal oxide or other salt of the metal such as the oxide or other salt of aluminum, titanium, chromium, zirconium, boron or any other suitable metal.

Suitable aqueous sols, colloidal primary particles based on silica or silicate available for sale on the market, for example, under the trade name LudoxTM, SnowtexTM, Bindzil®, NyacolTM, VinnsilTMand FennosilTM.

Unlike Zola, formed by dispersing a powder of, for example, precipitated silica, silica gel or fumed silica, colloidal particles in the ash prepared from alkali metal silicate by ion exchange or reduction of pH, have never been dried to a fine powder, as it has places is in the case for example, precipitated silica or silica gel.

It was found that the sols prepared from alkali metal silicate by ion exchange or decrease in pH, and in particular, having a relatively low surface area, provide good adhesion of the pigment particles with paper or cardboard that you can refuse the use of organic coating binders.

In the case of pigment particles in the composition comprising aggregates of colloidal primary particles, the average particle diameter of these primary particles is preferably from about 5 to about 125 nm, most preferably from about 7 to about 100 nm. Colloidal primary particles are preferably present in the form of water Zola, as described above.

The aggregation of the primary particles in the ash with the formation of a dispersion of porous aggregates can be performed by any suitable method, such as described in the book R.K. Iler, "The Chemistry of Silica" ("Chemistry of silica"), 1979, pages 364-407. The degree of aggregation can be determined by measuring the viscosity and the involvement of the Einstein equations and Mooney (for example, see the book R.K. Iler, "The Chemistry of Silica" ("Chemistry of silica"), 1979, pages 360-364). Aggregation can be performed as a separate phase or in a mixture that also contains other p is Glennie particles.

In one embodiment, anionic Sol (containing negatively charged colloidal primary particles) and cationic Sol (containing positively charged colloidal primary particles) are mixed, resulting in the formation of porous aggregates of primary particles of both nuclei.

In yet another embodiment, the salt is preferably selected from divalent salts, multivalent metals or complex salts added to the anionic or cationic solo, also resulting in the formation of porous aggregates. Examples of salts are aluminum chloride, polychloride aluminum, polysulphate aluminosilicate, aluminum sulfate, zirconium carbonates, zirconium acetates, borates of alkali metals and mixtures thereof.

In yet another additional embodiment, for the formation of aggregates of primary particles using bridge connection. Examples of suitable bridging compounds are synthetic natural polyelectrolytes, such as CMC (carboxymethylcellulose), PAM (polyacrylamides), polyDADMAC (chloride polymer of diallyldimethylammonium), polyallylamine, polyamine, starch, guar gum and mixtures thereof.

Can also be used with any combination of one, two or all three of the aforementioned aggregation methods.

Each porous aggregate is formed at IU the e of the three primary particles, which initially forms at least some of the pores. The average particle diameter of the aggregates is preferably from about 0.03 to about 25 microns, more preferably from about 0.05 to about 10 microns, most preferably from about 0.1 to about 5 microns. It should be clear that the average diameter of the porous aggregates is always larger than the average diameter of the primary particles of which it is formed. The surface area of the aggregates is usually essentially the same as that of the primary particles.

Particles of inorganic pigments can optionally include particles of one or more other inorganic materials, such as particles of kaolinites, smectites, talkitive, minerals, calcium carbonate, precipitated calcium carbonate, precipitated silica, silica gel, fumed silica and mixtures thereof. Preferably the particles of the inorganic pigments include a combination of colloidal particles based on silica or silicate, as described previously, and other inorganic particles, as mentioned above. The content of colloidal particles based on silica or silicate, preferably in the ash derived from alkali metal silicate by ion exchange or reducing the pH preferably ranges from about 10 to 100 wt.%, n is the most preferably from about 30 to 100 wt.% or from about 50 to 100 wt.% of the total number of particles of the dry pigment.

Precipitated silica has a ratio to the silicon oxide obtained when practically all particles of silicon oxide in an aqueous medium is subjected to coagulation in the form of loose aggregates, extracted, washed and dried. Precipitated silica commercially available on the market, for example, under the trade name TixosilTM.

Silica gel is related to particles composed of silica gel (usually described as a coherent, rigid three-dimensional mesh structure of adjoining particles, colloidal silica). Silica gel is available in the market, for example, under the trade name SylojetTM.

Pyrogenic silica is related to the silica obtained by flame hydrolysis. Fumed silica commercially available on the market, for example, under the trade name CabosilTMand AerosilTM.

The total content of particles of inorganic pigments in the composition preferably ranges from about 1 to about 80 wt.%, most preferably from about 5 to about 70 wt.%, particularly most preferably from about 10 to about 60 wt.% or from about 20, or even from about 25 to about 60 wt.%.

Pigment composition preferably includes a water-soluble salt of aluminum is I, which preferably is present in the particles of the dry pigment in an amount from about 0.1 to about 10 wt.%, most preferably from about 0.2 to about 5 wt.%, calculated as the contents in wt.% aluminum oxide (Al2O3). Can be applied any containing aluminum salt, and examples of the salts include aluminum chloride, polychloride aluminum, polysulphate aluminosilicate, aluminum sulfate and mixtures thereof. The aluminum can be present completely or partially on the surface of colloidal particles based on silica or silicate, or, optionally, other pigment particles, or in the aqueous phase.

The full content of water-soluble aluminium salts can come from that which is present in a modified cationic aluminum ash, used to obtain a pigment composition. However, the pigment composition may also include additional aluminium salt.

Pigment composition preferably includes a cationic organic polymer, preferably with an average molecular mass Mwfrom about 2000 to about 1000000, most preferably from about 2000 to about 500,000 or from about 4,000 to about 200,000. The distribution density of the charge is preferably from about 02 to about 12 mEq/g, most preferably from about 0.3 to about 11 mEq/g or from about 0.5 to about 10 mEq/g of the Cationic organic polymer is preferably present in the pigment dispersion in an amount of from about 0.1 to about 20 wt.%, more preferably from about 0.3 to about 15 wt.%, most preferably from about 0.4 to about 10 wt.% in relation to the number of particles of the dry pigment. Examples of suitable cationic organic polymers include synthetic and natural polyelectrolytes, such as PAM (polyacrylamides), polyDADMAC (chloride polymer of diallyldimethylammonium), polyallylamine, polyamine, polysaccharides and mixtures thereof, preferably satisfies the above-mentioned process conditions with regard to molecular weight and density of the charge distribution. The cationic polymer may be present partially or completely on the surface of colloidal particles based on silica or silicate and, optionally, other pigment particles, or in the aqueous phase.

Particularly preferred compositions include one or both of the water-soluble aluminum salts described above and a cationic polymer described above.

The pigment composition may also include other additives commonly used for coating Nobunaga, such as stabilizers, modifiers rheological characteristics, optical brighteners, lubricants, reagents for lowering the solubility of the dyes, adhesive, binder materials, etc. and a variety of impurities from raw materials. The total amount of other additives and possible impurities is preferably from 0 to about 50 wt.%, most preferably from 0 to about 30 wt.% calculated on the dry matter content. The total dry matter content of the pigment composition is preferably from about 2 to about 80 wt.%, most preferably from about 10 to about 75 wt.% or from about 20 or even 30 to about 75 wt.%.

Pigment composition described above, preferably remains stable for at least one week, most preferably at least one month. The composition may be used directly for coating paper or cardboard, or as an intermediate product to obtain a coating composition with additional components.

It was found that the composition including the pigment particles of the optional aggregated primary particles based on silica or silicate with a low surface area, etc is doctitle less than 450 m 2/g and prepared from alkali metal silicate by ion exchange or decrease in pH, as described earlier,

The invention further relates to a method for producing a pigment composition described above, comprising mixing polyalkyleneglycol and water composition, comprising particles of inorganic pigment comprising colloidal particles based on silica or silicate, in such quantities that are required to obtain a composition in which polyalkyleneglycol ranges from 50 to 100 wt.%, preferably from 60 to 100 wt.% or from 70 to 100 wt.% from the total amount of organic material in the composition, and the mass ratio of colloidal particles based on silica or silicate to the organic material in the composition is from 1:3 to 30:1, preferably from 1:1 to 20:1 or 1.5:1 to 10:1. Polyalkyleneglycol preferably is present essentially in pure form and is preferably added to the aqueous dispersion of particles of inorganic pigment, for example, by dissolving the solid powder in water dispersion, but can also be in advance diluted or dissolved, for example, in the water.

A composition including a water-soluble salt of aluminum and/or cationic organic polymer is preferably obtained by mixing these components with the aqueous dispersion, for example by the Sol, the colloid is lnyh particles based on silica or silicate, optional also includes other pigment particles described here, and then adding polyalkyleneglycol. Colloidal particles of silica or silicate, water-soluble aluminium salt and a cationic polymer are preferably blended in such a way as to avoid substantial gelation or precipitation. For example, an aluminium salt and a cationic polymer can be mixed with the education of their aqueous solution, and then this solution can be added to the water dispersion of colloidal and, optionally, other pigment particles, preferably with stirring, to ensure that in the resulting dispersion of all time remains the resulting cationic charge of the particles. A variety of suitable methods of mixing colloidal particles based on silica or silicate and, optionally, other pigment particles with aluminum salts and cationic polymers are also described in the previously mentioned application WO 2006/049546 and WO 2006/049547.

In regard to suitable and preferred amounts and types of components description above pigment composition refers to the following.

The aspect of the invention relates to aqueous pigment composition obtained by the method described above.

The invention also concerns the use of the pigment composition, described above, for the application of aircraft the Oia on paper or cardboard.

The invention additionally relates to a method of obtaining a coated paper or paperboard, including the stage of applying pigment composition described above as a coating at least on one side of the paper or cardboard tape.

The coating is preferably applied in a quantity sufficient to achieve a surface density of from about 0.4 to about 40 g/m2more preferably from about 0.5 to about 40 g/m2most preferably from about 1 to about 25 g/m2particles of inorganic pigment from pigment composition per unit area of the coated side of paper or cardboard and tape. In many cases, the amount of dry matter in the coating per unit area of the coated side of the paper or cardboard, preferably ranges from approximately 0.7 to approximately 50 g/m2most preferably from about 1.0 to about 30 g/m2.

The coating is preferably applied on the uncoated side of the paper or paperboard, but may be applied over the previously applied coating layer of the same or a different coating composition. It is preferable not to apply any additional coating of a different type on top of the layer formed from the coating described in this document.

Applied the e coating may be performed either on paper or paperboard machine, either out of paper or cardboard machine. In any case, can be applied to any type of method of coating. Examples of methods of coating is the coating on the installation with a doctor blade, floor air scraper, coating roller, coating, spray coating method, spray coating using adhesive media (for example, coating with a film press), and injection molding floor. In the case of coating with the help of precisely metering the film coating can be used a variety of shafts and pressure of the pressing shafts, for example, from about 0.5 to about 8 bar, or from about 1 to about 5 bar.

After coating on paper it dried that in the case of machine coating is preferably performed in the drying section of the machine. Can be used any of the drying methods, such as drying, infrared radiation, hot air, heated rollers or any combination thereof. The paper may then be subjected to any kind of traditional processing such as calendering and the like. To achieve the desired smoothness of the surface can be applied calendering with a variety of pressures, for example, from approximately 20 kN/m or below up to about 700 the N/m or higher, or from about 50 or from about 100 to about 600 kN/m

The term "coating"as used here, refers to any way in which pigments are applied to the surface of paper or paperboard, thereby including not only traditional coating, but in other ways, such as, for example, the pigmentation.

Paper and cardboard, which should be covered with a coating, can be made from any grade of pulp such as chemical pulp type, sulfate, sulfite or pulp from the process “Organosolve”, mechanical pulp type thermomechanical pulp (TSR), chemi-thermomechanical pulp (STMR), refiner mechanical pulp or ground wood pulp from wood of deciduous or coniferous, bleached or unbleached pulp, which is based on fresh or recycled fibers, or any combination. In accordance with the invention, the coating can be applied on paper or cardboard from any other type of pulp. Paper and cardboard can be glued inside to a variety of degrees or unsized, and may contain commonly used fillers such as various kinds of clay, calcium carbonate, talc, etc. the weight may be within a wide range, for example, will bring the flax 40 to about 800 g/m 2or higher, or from about 70 to about 300 g/m2.

For further details and embodiments of the pigment compositions of the above description mentions the following :

Finally, the invention relates to coated paper or cardboard, obtained as described above, and covered with paper or cardboard, having at least one side of the floor, including polyalkyleneglycol and particles of inorganic pigment comprising colloidal particles based on silica or silicate, or their aggregates, in which polyalkyleneglycol ranges from 50 to 100 wt.%, preferably from 60 to 100 wt.% or from 70 to 100 wt.% from the total amount of organic material in the coating, and the mass ratio of colloidal particles based on silica or silicate, or their aggregates to organic material in the composition is from 1:3 to 30:1, preferably from 1:1 to 20:1 or 1.5:1 to 10:1.

This kind of paper or cardboard, preferably consists essentially transparent or substantially opaque layer comprising particles of inorganic pigment of the coating composition, the pigment particles, preferably forming a nanostructure. The amount of dry matter in the coating is preferably from about 0.5 to about 50 g/m2most of predpochtitelno approximately 1.0 to approximately 30 g/m 2. The number of particles of inorganic pigment of the above pigment composition per unit area of the coated side of the paper or paperboard is preferably from about 0.7 to about 40 g/m2most preferably from about 1 to about 25 g/m2. Preferably on top of this layer was not coated with any other type.

It was found that the paper or cardboard according to the invention particularly suitable for inkjet printers, providing a low degree of confusion and craptastic lines, and high density printing for color images, but can also be used effectively for other types of printing processes, such as laser printing, flexo, letterpress, gravure printing, offset printing and screen printing. The surface roughness is measured by a unit of Parker (Parker Print Surf (PPS)), for example, may be from about 0.5 to about 10 microns, or from about 1 to about 5 microns. Particularly preferred that such good properties can be achieved in a simple way when applying only small amounts of coverage and without the need to use diverse various coating layers on paper or cardboard. Moreover, the main components of the pigment composition can be is prepared from readily available raw materials.

The invention will now be described further in the examples below. If not specified something else, all parts and percentages are related to the parts and percentage by weight. The levels expressed in units of “pph”, indicate the number of parts per hundred parts of dry pigment particles.

Example 1: Pigment dispersion with a dry matter content of 43.9 per cent were prepared from a mixture of silicates Bindzil®80/50 (anionic silicasol having a surface area of approximately 80 m2/g) from the company Eka Chemicals, and kaolin coating clay, SPSTMfrom the company Imerys Mineral. Dry mass ratio between silicates and clay dispersion was 75/25. To make the pigment particles of cationic character, together with the pigment compound was mixed 8,3 pph of polychloride aluminum (LocronTML from the company Clariant) and 5.0 pph polyDADMAC, the average molecular mass Mw4000, (40%solution of the polymer PolyquatTM40 U 05 NV from the company Katpol). Next, the resulting dispersion is called A.

Two of the coating composition, based on the pigment composition prepared without adding any organic binders of the type of starch, polyvinyl alcohol or latex.

Century Pigment dispersion A (see above) was diluted to a dry matter content of 34 wt.%.

C. Pigment dispersion was diluted with water and then added 31 pph, al is langille (PEG) with an average molecular mass M w20000 from Merck, to obtain a dry matter content of 35 wt.%. Polyethylene glycol (PEG) was in the form of 100%of the powder was dissolved directly in the pigment dispersion.

Two of the coating composition was applied on one side of the paper base using the laboratory setup for the continuous coating of the firm DT Paper Science, Finland, working as ductory adhesive press with a speed of 10 m/min Paper base was slaapproblemen writing paper width of 30 cm and a base weight of 85 g/m2. After passing through the gluing press, the paper was done in an infrared dryer with subsequent air drying. Coated paper was kondicionirovanie in an environment with 50%relative humidity at 20°C and determined the weight of the coating. The paper was cut into A4 sheets and perform a test print on three different inkjet printers, EpsonTMStylos C86, HPTMdeskjet 5850 and CanonTMip4000.

The print results were evaluated using printed images with seven blocks of color, cyan, Magenta, yellow, green, red, blue and black. Printed blocks and nepropitannoy paper was measured using a spectrophotometer (Color Touch 2 from the firm Technidyne), and calculated the volume of the color gamut. The volume of the color gamut was approximatively to the dodecahedron in the color space the L*a*b*, and measure the Oia colors gave the corners of dvenadtsatigrannaya (see the publication “Rydefalk Staffan, Michael Wedin; Literature review on the colour Gamut in the Printing Process-Fundamentals, PTF-report no 32, may 1997" ("literature Review on the basics of assessment colours in printing processes").

The results are shown in the table below, in which you can see that the top part To give the best total color gamut.

CompositionCoating weight, g/m2The volume of the color gamut of EpsonThe volume of the color gamut HPThe volume of the color gamut, Canon
The paper base0171528172037150500
In5,3201131205269178024
5,6202731217743184420

Example 2: The test was performed in full-scale paper machine Furdrine equipped doctorum glue press machine typically produces printing paper with high baseline weight. During the test gotovolume basis with a basic weight of 200 g/m 2made from 100%unbleached sulphate Kraft pulp of hardwood, and precipitated calcium carbonate as a filler at a speed of approximately 200 m/min, the Surface of the paper base was treated in the production process in the glue press on both sides of the composition, as the composition of example 1, except that the dry matter content was 34 wt.%. The paper is then passed through the drying rolls and finally subjected to a weak calandrinia in the production process prior to winding into a roll. No problems with reduce resistance did not occur.

The resulting paper was kondicionirovanie, prospectively and evaluated as described in example 1 and the results are shown in the table below:

CompositionCoating weight, g/m2*The volume of the color gamut, Epson*The volume of the color gamut HP*The volume of the color gamut, Canon*
The paper base0177781173917154594
13222864 222574198195
* On average for both parties.

It should be noted that the coating composition containing silicasol and polyethylene glycol (PEG), in this realistic full-scale test gave a very good printing results and a significant improvement in the quality of the paper base. It should also be noted that the coating composition had a high degree of perception of the coating in the glue press (high coating weight), meaning that a simple device for coating type doktorova adhesive press could be used to produce "similar to the coated paper, which is usually only possible when using more complex applicators, such as machines with a doctor blade coating.

Example 3In this test, five different coating compositions were prepared with the aim of obtaining the maximum dry matter content for each part (for reasons of tirereplacement, in the sense that the viscosity of the composition should be between 100-1000 JV, as measured using Brookfield viscometer (spindle No. 4 at 50 rpm)).

D. Composition was prepared by adding 24 g of dry polyethylene glycol (PEG) (the same as in example 1) to 176 g of the pigment dispersion a of example 1 while stirring with a magnetic stirrer, about what adowanie the final composition of the dry matter content and 50.6 wt.%, the viscosity of 860 SP, and containing 34 pph PEG per particle of the dry pigment.

E. of 8.2 g of dry PEG (same as in example 1) was dissolved in 119 g of the pigment dispersion a of example 1 and then added 82 g of 10 wt.% an aqueous solution of polyvinyl alcohol (PVOH) under stirring with a magnetic stirrer. The PVOH solution was prepared by dissolving powder PVOH (ErcolTM26-88 from the company Ercol, product type, commonly used as binders in the production of paper for inkjet printing) in hot water at 90°C for 2 hours. The maximum concentration of PVOH, which could be achieved was 10 wt%. The dry matter content in the final composition was equal to 32.8 wt.%, viscosity 244 JV, the content of PEG 17 pph and content PVOH 17 pph.

F. 164 g of 10 wt.% the PVOH solution (the same as in paragraph (E) was slowly added to 119 g of the pigment dispersion a of example 1 while stirring with a magnetic stirrer. The dry matter content in the final composition was equal to 24.3 wt.%, viscosity 516 JV, and the content of PVOH 34 pph.

G. 20 wt.% an aqueous solution of a typical starch for adhesive media was prepared by cooking the starch granules (S* film 07312 from the company Cerestar) in water. 20 wt.% the concentration was maximum, what managed to get. 119 g of the pigment dispersion a of example 1 was mixed with and 82.2 g of starch solution, with the formation of the final composition with soderzhaniemmasla substances to 34.1 wt.% and a viscosity of more than 1000 SP.

H. 60 g of dry powder of silica gel, SylojetTMP612 from the company Grace Davison, was dispersible in to 150.7 g of water with the formation of highly viscous dispersion. of 20.4 g (34 pph) PEG (same as in example 1) and 3 g (5 pph) polyDADMAC (same as in example 1) dissolved in the pigment dispersion with the formation of the final composition having a dry matter content is 34.9 wt.% and a viscosity of more than 300 SP.

Five formulations were applied using a laboratory setup for continuous coating, as in example 1 (the same paper base, applicator, speed etc). Paper with a surface treatment was kondicionirovanie, prospectively and evaluated as described in example 1. The results are shown in the table below:

CompositionCoating weight, g/m2The volume of the color gamut of EpsonThe volume of the color gamut HPThe volume of the color gamut, Canon
The paper base0171528172037150500
D11227492235453212530
E5197735214238174423
F7202034203175166695
G7215063192036160857

HThe pigments had no clutch with paper-based---

Obviously, part D, including silicasol and PEG, made possible the application of large quantities of pigment particles in a single operation coating, and also gave a higher color gamut. When PEG was partially (E) or fully (F and G) replaced by a water soluble binder means, PVOH or starch, the color scheme is greatly reduced. In test h, where the precipitated silica used together with PEG, the pigment is extremely poorly contacted the paper, showing that this type of pigment does not require the addition of binders.

Example 4In these trials used on the and silicates from the company Eka Chemicals AB, Bindzil®40/220 (anionic silicasol mass dry matter concentration of 40 wt.% and surface area of 220 m2/g) and Bindzil®CAT 220 (Bindzil CAT 220 represents a cationic silica Sol with a mass concentration of dry matter 35 wt.% and surface area of 220 m2/g).

I. 175 g Zola Bindzil 40/220 was diluted in 25 g of water to achieve a dry matter content of 35 wt.%.

J. 175 g Zola Bindzil 40/220 diluted 54,9 g of water. 16,1 g of dry powder of 100%PEG (Mw35000) from Merck was dissolved in silicate with the formation of a composition having a dry matter content of 35 wt.% and containing 23 pph PEG.

K. 200 g Zola Bindzil CAT 220 diluted 10.2 g of water. of 14.7 g of PEG (as in paragraph (J) was dissolved in the ashes with the formation of a composition having a dry matter content of 38 wt.% and containing 23 pph PEG.

These three composition was applied onto base paper and tested as in example 1. The results are shown in the table below:

CompositionCoating weight, g/m2The volume of the color gamut of EpsonThe volume of the color gamut HPThe volume of the color gamut, Canon
The paper base0171528 172037150500
I13120544184116156466
J13166290201414166555
To11238878222453189849

It turns out that the combination of silica Sol and PEG gave the best aggregate results of the printing.

1. Water pigment composition containing polyalkyleneglycol with an average molecular mass Mwfrom approximately 5,000 to approximately 75,000,
and particles of inorganic pigment containing colloidal particles based on silica or silicate or their aggregates, in which polyalkyleneglycol ranges from 50 to 100 wt.% from the total amount of organic material in the composition and the mass ratio of colloidal particles based on silica or silicate or their aggregates to organic material is from 1:3 to 30:1.

2. Pigment composition according to claim 1, in which the number of polyalkyleneglycol in the composition is from about 1 to about 50 wt.%.

3. yentna composition according to any one of claims 1 and 2, in which the named polyalkyleneglycol is a polyethylene glycol.

4. Pigment composition according to claim 1, in which composition contains as a source of pigment particles aqueous colloidal Sol, optional aggregated primary particles based on silica or silicate.

5. Pigment composition according to claim 4, in which colloidal primary particles in the ash formed from an aqueous solution of alkali metal silicate, where alkali metal ions have been removed by a process of ion exchange, or where the pH of a solution of silicate of alkali metal has been reduced by the addition of acid.

6. Pigment composition according to claim 1, in which the colloidal particles include particles of oxide silicon.

7. Pigment composition according to claim 1, in which the colloidal particles include particles based on silicate.

8. Pigment composition according to claim 7, in which the particles on the basis of the silicate include aluminosilicate or borosilicate.

9. Pigment composition according to claim 1, in which the colloidal particles based on silica or silicate or their aggregates have a surface area from about 30 to about 450 m2/year

10. Pigment composition according to claim 1, in which the colloidal particles based on silica or silicate have an average diameter of from about 0.005-about 25 who km.

11. Pigment composition according to claim 1, in which the mentioned pigment particles include particles of at least of kaolinites, smectites, talkitive, minerals, calcium carbonate, precipitated calcium carbonate, and mixtures thereof.

12. Pigment composition according to claim 1, additionally comprising at least one water soluble aluminium salt.

13. Pigment composition according to item 12, in which the mentioned at least one water soluble aluminium salt represents at least one of aluminum chloride, polychloride aluminum, polysulfate aluminosilicate, aluminum sulfate and mixtures thereof.

14. Pigment composition according to claim 1, additionally comprising at least one cationic polymer.

15. Pigment composition according to 14, in which the mentioned cationic polymer has a molecular mass Mwfrom about 2000 to about 1,000,000 and a charge density from about 0.2 to about 12 mEq/g

16. Pigment composition 14., in which the mentioned at least one cationic polymer represents at least one of PAM (polyacrylamide), polyDADMAC (polymer chloride of diallyldimethylammonium), polyallylamine, polyamines, polysaccharides, and mixtures thereof.

17. A method of obtaining a pigment composition according to any one of claims 1 to 16, comprising mixing polyalkyleneglycol and aqueous compositions containing cha is based inorganic pigment, including colloidal particles based on silica or silicate or their aggregates, in such quantities as to obtain a composition in which polyalkyleneglycol ranges from 50 to 100 wt.% from the total amount of organic material in the composition, and the mass ratio of colloidal particles based on silica or silicate or their aggregates to organic material is from 1:3 to 30:1.

18. The method according to 17, comprising mixing the water dispersion of colloidal particles based on silica or silicate with a water-soluble aluminum salt and a water-soluble cationic polymer and then adding polyalkyleneglycol.

19. The method according to any of PP and 18, in which colloidal particles based on silica or silicate or their aggregates have a surface area from about 30 to about 450 m2/year

20. Water pigment composition obtained by the method according to any of PP-19.

21. The use of a composition according to any one of claims 1 to 16 for coating paper or cardboard.

22. A method of obtaining a coated paper or paperboard, including stage coating composition according to any one of claims 1 to 16, at least on one side of the paper or cardboard tape.

23. The method according to item 22, in which the coating is applied in a quantity sufficient to achieve a surface density of from about 0 to about 40 g/m 2particles of inorganic pigment from pigment composition per unit area of the coated side of the paper or cardboard.

24. Coated paper or cardboard, having at least one side of the floor, including polyalkyleneglycol, and particles of inorganic pigment comprising colloidal particles based on silica or silicate or their aggregates, in which polyalkyleneglycol ranges from 50 to 100% of the total amount of organic material in the coating and the mass ratio of colloidal particles based on silica or silicate or their aggregates to organic material is from 1:3 to 30:1.

25. Paper or cardboard produced by the method according to any of PP and 23.



 

Same patents:

FIELD: textile fabrics, paper.

SUBSTANCE: aqueous solutions are related to toluylene optical bleaches and may be used in production of chalk overlay paper of high whiteness. Aqueous solutions contain at least one optical bleach, polyvinyl alcohol, having extent of hydrolysis over 75% and Brookfield viscosity of 2-40 mPa·s, and water. This composition may be used for paper coating. It may be applied on paper after its moulding to produce chalk overlay paper.

EFFECT: provision of stability in storage of aqueous solutions of toluylene optical bleaches and simplified method for production of chalk overlay paper.

9 cl, 3 tbl, 3 ex

FIELD: production of ink-jet printing paper with special pigment coat applied thereto.

SUBSTANCE: method involves manufacturing paper-base; applying onto one side of paper-base ink-perceptive coat consisting of pigment, binder and cationic fixative; applying onto opposite side of paper-base curling-preventive coat; refining both surfaces of paper; using mixture of amorphous silicon dioxide and calcium or kaolin carbonate as ink perceptive pigment for coat, said mixture having specific outer surface less than 20 m2/g in the ratio of (75-45):(25-55); using polyvinyl alcohol as binder in an amount of 20-25% by weight of pigment; using polydiallyl dimethylammonium chloride as cationic fixative.

EFFECT: improved printing characteristics and increased paper surface strength.

3 cl, 1 tbl, 7 ex

FIELD: pulp-and-paper industry.

SUBSTANCE: coating composition consisting of ink-compatible pigment, binder, and cationic fixative is deposited onto one of the sides of based paper and the other side is covered with detwisting coating, after which coating is ennobled by means of supercalendering. As pigment, mixture of amorphous silicon dioxide with calcium carbonate or kaolin with outer specific surface 60-85 m2/g at ratio (25-50):(75-50). Binder is a mixture of polyvinyl alcohol with latex selected from class of styreneacrylic copolymers at ratio (20-25%):(7-18%) based on the weight of pigment. Cationic fixative is poly(diallyldimethylammonium chloride), which is directly incorporated into coating composition in amount 5-10%.

EFFECT: enabled image quality and paper surface strength control.

3 cl, 1 tbl, 13 ex

FIELD: pulp-and-paper industry.

SUBSTANCE: coating composition consisting of ink-compatible pigment, water-soluble binder, and cationic fixative is deposited onto one of the sides of based paper and the other side is covered with detwisting coating, after which glossy surface is formed. Coating composition is supplemented by wettability controlling agent based on polydimethylsiloxane resins in amounts 0.4 to 1.6% of the weight of pigment. Water-soluble binder is a mixture of polyvinyl alcohol with polyvinylpyrrolidone at ratio (90-50):(10-50) in amount 40-60% and styreneacrylic latex in amount 15-20% of the weight of pigment. When forming glossy surface, polyethylene oxide-based plasticizer is used in amount 7-15% of the weight of pigment followed by supercalendering at pressure in roll contact zone 20-25°C and temperature 50-90°C.

EFFECT: improved manufacturability of process.

5 cl, 1 tbl, 54 ex

FIELD: pulp and paper industry; methods of production of the pigment for manufacture of the cardboard and paper.

SUBSTANCE: the invention is pertaining to the method of production of the pigment for manufacture of the cardboard and paper and may be used in pulp and paper industry at production of the filled paper, the coated paper and the cardboard. In the water at intense stirring feed powders of calcium hydrate and calcium carbonate at the ratio of the indicated components accordingly from 1.0:2.2 up to 1.0:12.9. The produced suspension is gradually added with aluminum sulfate at its ratio to the total mass of the calcium hydroxide and calcium carbonate from 1.0:0.85 up to 1.0:4.30. Then the temperature of the mixture is increased up to 8О-85°С and the produced reaction mixture is kept at stirring within 90-180 minutes with formation of the dispersion of the pigment with the share of the dry substances in it equal to 20-35 %. Then the dispersion is dried and grinded into the powder. The powder is dispersed in the water containing the given amount of the dissolved coolant and-or binding - starch or polyvinyl alcohol. The technical result of the invention production of the pigment with the new properties, that allow to expand the field of its application at manufacture of various types of the cardboard and the paper.

EFFECT: the invention ensures production of the pigment with the new properties, expansion of the field of its application at manufacture of various types of the cardboard and the paper.

2 tbl

FIELD: paper-and-pulp industry.

SUBSTANCE: invention relates to pigment, which can be used in manufacture of paper with filler, coated paper, and cardboard. Calcium hydroxide and calcium carbonate powders taken in proportion between 1.0:2.2 and 1.0:23.5 are added to vigorously stirred water, after which temperature of mixture is raised to 80-85°C and resulting reaction mixture is kept being stirred for 90-180 min to form dispersion of pigment containing 20-35% solids.

EFFECT: improved quality of pigment at lower cost and extended application area.

3 tbl

The invention relates to a method of making a composition used in the paper industry for the application of surface coatings on paper

The invention relates to compositions of decorative coatings paper for Wallpaper and can be used in the manufacture of Wallpaper

Paper sizing // 2429323

FIELD: textile, paper.

SUBSTANCE: invention relates to a water dispersion (its version) of a cellulose-active gluing substance (its version), a method to produce the water dispersion (its version), application of the water dispersion and a method of paper making. The water dispersion of the cellulose-active gluing substance contains an acid anhydride, an anion polyelectrolyte and a nitrogen-containing organic compound, which is an amine or a corresponding quaternary ammonia compound, having the molecular weight of less than 180 or having one or several hydroxyl groups. The method to produce the water dispersion of the cellulose-active gluing substance and its version includes dispersion of the acid anhydride in the water phase in presence of the anion polyelectrolyte and the nitrogen-containing organic compound, which is the amine or the corresponding quaternary ammonia compound, having the molecular weight of less than 180 or having one or several hydroxyl groups. The above specified water dispersions of the cellulose-active gluing substance may be used for sizing in mass or for surface sizing in paper making. The method of paper making includes addition of the above-specified water dispersions of the cellulose-active gluing substance to the water suspension of cellulose with subsequent dehydration of the produced suspension on a net of a paper-making machine or by application of these dispersions onto a surface of a cellulose sheet.

EFFECT: improved stability of the gluing water dispersion and efficiency of sizing, energy and capital cost saving.

41 cl, 13 tbl, 7 ex

FIELD: printing industry.

SUBSTANCE: pigment composition in the form of aqueous suspension includes pigment particles of synthetic amorphous silicon dioxide or aluminium silicate, at least one water-soluble aluminium salt and at least one cationic polymer having molecular weight from approximately 2000 to approximately 1000000, and density of charge is from around 0.2 to around 12 meq/g. Particles of synthetic amorphous silicon dioxide or aluminium silicate are selected from the group that consists of deposited silicon dioxide, silicon dioxide in the form of gel, colloidal primary particles of silicon dioxide, aluminium silicate or their mixture, porous aggregates formed by aggregation of primary colloidal particles of silicon dioxide, aluminium silicate or their mixture in aqueous sol or mixture of one or several above mentioned types of particles. Amount of cationic polymer makes from approximately 0.1 to 15 wt % per amount of dry pigment particles. Method for production of pigment composition includes mixing particles of synthetic amorphous silicon dioxide or aluminium silicate, water soluble aluminium salt and cationic polymer without gel formation or deposition. Composition is used to apply coating onto paper or cardboard web.

EFFECT: pigment composition is easily applied onto surface of paper or cardboard for jet printing.

20 cl, 4 ex

FIELD: printing industry.

SUBSTANCE: composition of pigment in the form of aqueous dispersion or suspension is described, including (a) porous aggregates created by aggregation of colloid primary particles of silicon dioxide, aluminium silicate or their mixture in water sol, and having average diametre from 0.03 to 25 mcm, and (b) particles of filler, average size of particles in which is more than average diametre of porous aggregates, at mass ratio of porous aggregates to filler particles from 0.01:1 to 3:1. The following are also described: method for its use, composition for coating of paper or cardboard and method for its application, method for coating of paper or cardboard and paper or cardboard made by this method.

EFFECT: production of high-quality paper or cardboard for use in jet printing and improvement of printing quality.

16 cl, 4 tbl, 4 ex

FIELD: textile fabrics, paper.

SUBSTANCE: method is related to production of coated paper or cardboard. Method includes application of pigment composition as coating on at least one side of paper or cardboard web. Specified pigment composition is water dispersion, which includes optionally aggregated colloidal particles of silicon dioxide or aluminium silicate as pigment particles, which are prepared from alkali metal silicate by ion exchange or pH reduction and having surface area of approximately from 30 m2/g to approximately 450 m2/g. Coating contains also at least one cationic component selected from group that consists of water-soluble aluminium salts and cationic polymers with molecular weight from approximately 2,000 to approximately 1,000,000 and charge density from approximately 0.2 mEq/g to approximately 12 mEq/g, in which at least approximately 0.4 g of pigment particles from pigment composition is applied on m2 of coated side of paper or cardboard web. Invention is also related to paper or cardboard produced by this method. It is also related to composition of above mentioned pigment in the form of water dispersion, which includes less than approximately 3 wt % of organic binders and to method of above mentioned pigment composition production, in which mixing is done to produce water dispersion in order to avoid gel formation and deposition.

EFFECT: improvement of printing and strength properties of coating, and also lower scuffing of paper.

26 cl, 5 tbl, 4 ex

FIELD: pulp-and-paper industry, in particular, paper sheet having surface feeling hash to the finger, and method for applying coating onto paper sheet.

SUBSTANCE: paper sheet of such structure may be used for manufacture of paper or plastic medium for carrying of printed information, paper or plastic package, cover used in stitching and binding processes, or cardboard or plastic carton having surface feeling hash to the finger. At least one side of paper sheet is coated with layer containing non-compressible microscopic particles of non-gelatinized starch grains, or said particles are produced by grinding of plastic material. Method involves treating at least one side of paper sheet with water-based composition containing non-compressible microscopic particles which are made three-dimensional and rounded, binder, and filler; drying paper sheet after treatment. Particles are non-gelatinized starch grains, or particles are produced by grinding of plastic material. Method allows paper sheet to be produced, which has roughness coefficient Kd below 0.5.

EFFECT: simplified method and improved quality of paper sheet.

17 cl, 16 dwg, 1 tbl, 3 ex

FIELD: production of ink-jet printing paper with special pigment coat applied thereto.

SUBSTANCE: method involves manufacturing paper-base; applying onto one side of paper-base ink-perceptive coat consisting of pigment, binder and cationic fixative; applying onto opposite side of paper-base curling-preventive coat; refining both surfaces of paper; using mixture of amorphous silicon dioxide and calcium or kaolin carbonate as ink perceptive pigment for coat, said mixture having specific outer surface less than 20 m2/g in the ratio of (75-45):(25-55); using polyvinyl alcohol as binder in an amount of 20-25% by weight of pigment; using polydiallyl dimethylammonium chloride as cationic fixative.

EFFECT: improved printing characteristics and increased paper surface strength.

3 cl, 1 tbl, 7 ex

FIELD: pulp-and-paper industry.

SUBSTANCE: coating composition consisting of ink-compatible pigment, binder, and cationic fixative is deposited onto one of the sides of based paper and the other side is covered with detwisting coating, after which coating is ennobled by means of supercalendering. As pigment, mixture of amorphous silicon dioxide with calcium carbonate or kaolin with outer specific surface 60-85 m2/g at ratio (25-50):(75-50). Binder is a mixture of polyvinyl alcohol with latex selected from class of styreneacrylic copolymers at ratio (20-25%):(7-18%) based on the weight of pigment. Cationic fixative is poly(diallyldimethylammonium chloride), which is directly incorporated into coating composition in amount 5-10%.

EFFECT: enabled image quality and paper surface strength control.

3 cl, 1 tbl, 13 ex

FIELD: pulp-and-paper industry.

SUBSTANCE: coating composition consisting of ink-compatible pigment, water-soluble binder, and cationic fixative is deposited onto one of the sides of based paper and the other side is covered with detwisting coating, after which glossy surface is formed. Coating composition is supplemented by wettability controlling agent based on polydimethylsiloxane resins in amounts 0.4 to 1.6% of the weight of pigment. Water-soluble binder is a mixture of polyvinyl alcohol with polyvinylpyrrolidone at ratio (90-50):(10-50) in amount 40-60% and styreneacrylic latex in amount 15-20% of the weight of pigment. When forming glossy surface, polyethylene oxide-based plasticizer is used in amount 7-15% of the weight of pigment followed by supercalendering at pressure in roll contact zone 20-25°C and temperature 50-90°C.

EFFECT: improved manufacturability of process.

5 cl, 1 tbl, 54 ex

FIELD: paper industry.

SUBSTANCE: paper product comprises a substrate selected from paper or cardboard, and a coating on the substrate with voids in it. The coating on the substrate comprises a water soluble polymer. The water-soluble polymer is selected from a group consisting of starch, waxy corn starch, protein, polyvinyl alcohol, casein, gelatin, soybean protein, and alginates. The coating additionally comprises a crosslinking agent. The paper product is substantially free of an elastomeric material. A method of processing a substrate for the paper product comprises coating an aqueous solution of the polymer on the film substrate, fixation of an aqueous solution of the polymer by contacting of the aqueous solution of the polymer with a heated surface up to formation of voids in the film. The phase of fixation comprises at least a partial drying of aqueous polymer solution.

EFFECT: obtained paper product is characterised with improved smoothness with no increase in density and has excellent printability.

27 cl, 3 ex, 1 tbl, 17 dwg

FIELD: textile, paper.

SUBSTANCE: paper base is designed to form a decorative material of a coating. It represents a non-processed paper containing a white pigment and/or fillers and is coated with a covering solution, containing at least one water-soluble modified starch with special distribution of molecules according to molecular weight. Also a decorative paper or decorative material is proposed to form coatings with application of the above-specified paper-base.

EFFECT: improved quality of a finished product due to increased inner strength of fixation with high non-transparency and other mechanical properties, improved stability of paper size stability and increased average size of its pores.

7 cl, 2 tbl, 6 ex

FIELD: construction.

SUBSTANCE: wallpapers have a base and a face and a reverse sides. A coating that contains an antibacterial agent is applied onto the face side of the base. The coating antibacterial agent is represented by silver nanoparticles. The coating is produced by mixing of a varnish and a carbon porous carrier with silver nanoparticles in specified amount. Silver nanoparticles size is 2-50 nm. The carbon porous carrier has specific density of 0.03-0.1 g/cm3, specific surface of 50-200 m2/g and pore size of 5-50 nm. The varnish is a water-based acrylic varnish or an alkyd varnish. The wallpaper base is made of paper or cloth. The face surface of wallpapers is made of paper, cloth, fabric fibres or polyvinyl chloride. The carbon porous carrier with silver nanoparticles is in powder form. Glue is applied onto the reserves side of wallpapers.

EFFECT: higher quality of wallpapers and simplified technology of their manufacturing.

14 cl

FIELD: textile, paper.

SUBSTANCE: method includes formation of composition, containing water, raw starch and powder optical refining agent. Boiling of composition. Application of finished composition, at least on one surface of paper or cardboard base in coating press. Then base is dried. In another version of method composition is boiled at the temperature up to 299°F inclusive.

EFFECT: improved brightness of paper and cardboard.

7 cl, 4 dwg, 8 tbl, 1 ex

FIELD: fabrics, paper.

SUBSTANCE: invention is related to glossy chalk overlay universal paper for printing, which may be used in wide range of office equipment for printing, including jet and electrophotographic printing, to method of chalk overlay paper making. Chalk overlay paper contains paper web and pigment composition applied onto at least one surface of web. Specified composition of pigment coat comprises the first pigment with specific surface BET in the range from approximately 50 to 750 m2/g; the second pigment with specific surface BET in the range of approximately from 5 to 49 m2/g; and polymer binder. Besides specified chalk overlay paper has glossiness of coat equal to or more than approximately 30% at the angle of 75° and length of absorption Bristow less than approximately 180 mm.

EFFECT: paper has superb properties of ink absorption, toner fixation and provides for obtaining the imprint of high quality.

10 cl, 3 dwg, 15 tbl, 8 ex

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